As far as I can tell, you can only have one device at a time.  Is there really no way that I can have say, my boss gt100 as an input signal via USB, then my octa-capture as my output device?
 
 

The one device restriction is part of the ASIO specification. Other driver modes supported by SONAR do not have that restriction.

Afaik ,no,
ASIO driver can only handle one device at time.

And ASIO can handle several interfaces if they are identical, I have read on this forum.

ASIO: (Audio Stream Input Output) Developed by Steinberg and originally used with Cubase. (DAW) This standard driver type can be used on the PC or Mac platform. It provides a lower latency then WDM. It has a limitation though. It can only be used by one hardware device at a time. ASIO bypasses the normal audio path from a user application through layers of intermediary Windows operating system software so that an application connects directly to the sound card hardware. Every layer that is bypassed gives a reduction in latency. Because of this process ASIO offers a relatively simple way of accessing multiple audio inputs and outputs independently.


There is also a version of this called asio4all. This driver type allows you to use more than one device in an ASIO platform. It uses the WDM kernel for streaming. People either love or hate this driver type. It all depends on how well your hardware works with it. ASIO2ks is yet another version of this. It is becoming popular as well.


http://www.asio2ks.de


http://marcuscurtismusic....io-on-a-budget-part-1/

ASIO4ALL is intended for hosts that only support ASIO. There is no need for ASIO4ALL when using SONAR because it supports driver modes other than ASIO.

Kalle : "And ASIO can handle several interfaces if they are identical, I have read on this forum."

Only if the interace's driver supports aggregation, which some do.

But I think most don't.

Try using the WDM/KS driver mode.  This should allow you to use both and sometimes it even performs better thn ASIO.
 
Glen

Ah yes - this is one of the Sonar features that really makes me crazy!!!

I prefer WDM, or WASAPI because I can use multiple devices. Very few programs are this flexible. But sometimes one works better, sometimes another one works better. In a system that is relatively static that makes no sense.

Oh well, thanks bakers for the flexibility!

As was mentioned already if you wanted to hook up multiple interfaces you would have to switch to a driver mode other than ASIO. However if you are just looking to add extra inputs and you have two interfaces with optical connectors then you can daisy chain them. One would be the actual interface communicating with your computer (master) and the second would just use the optical connector to send extra channels to.

For example... I've got a Layla Echo 3G which has optical in/out. I also have a Focusrite Scarlett 18i6 which has an optical in (but no out). The optical in on the Scarlett gives me 4 extra channels (above and beyond the multi ins and analog ins it already has) at up to 96k (I think) and 8 extra channels at 44.1k. So in theory I can use an optical cable from the output of the Layla to the input of the Scarlett and then use the 8 analog inputs on the Layla which combined with the inputs on my Scarlett give me a total of 16 analog inputs at 44.1k (not counting the SPDIF on the Scarlett). 

The optical connector will sometimes be labeled ADAT.

Whether all this works? Well IDK... I haven't tried it yet but it's supposed to.